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The artillery walkers were generally deployed in squadrons of four and were usually placed behind advancing walkers like the All Terrain Tactical Enforcer. SPHA-Ts were able to provide defense for assault ships that were landing and devastating direct firepower. However, SPHA-Ts could only be charged up to a certain level. Although it took no less than 30 specialized clone troopers to man each gun platform, they were powerful and effective enough to blast through starship shields and hulls.
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It only used its twelve legs when maneuvering between firing positions when attacking an enemy target, a SPHA-T remained motionless to give its gunners added precision for aiming its extraordinarily heavy turbolaser beam. Combining the devastating firepower of a permanent laser cannon emplacement with the ability to liberally walk into battle on powerful articulated legs, the Self-Propelled Heavy Artillery Turbolaser (SPHA-T), also known as the Self-Propelled Heavy Artillery (SPHA), were the largest ground based weapons in the arsenal of the Grand Army of the Republic at 140.2 meters in length.
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